President Trump on Sunday signed off on updated travel restrictions that would limit entry for people coming to the U.S. from eight countries, as the existing travel ban is set to expire.

The new travel restrictions, set to take effect Oct. 18, would slow or limit entry from citizens of North Korea, Chad, Iran, Libya, Somalia, Syria, Venezuela and Yemen. North Korea and Venezuela were not listed in the earlier ban.

Iraqi citizens do not face the same travel restrictions, but will “be subject to additional scrutiny to determine if they pose risks” to U.S. security, the White House said.

Officials stressed that valid visas would not be revoked as a result of the proclamation. The order also permits, but doesn’t guarantee, case-by-case waivers.

“As President, I must act to protect the security and interested of the United States and its people,” the proclamation states. He later tweeted, “Making America Safe is my number one priority. We will not admit those into our country we cannot safely vet.”

The announcement comes the same day Trump’s temporary ban on visitors from six Muslim-majority countries is set to expire, 90 days after it went into effect.